begin RSPEC functional and unit tests for board validation.
Add several tests and a spec support helper.
functional tests failing correctly, start unit tests.
WIP passing function and unit game specs, progress on board unit specs
WIP RSpec tests on board.
Finish Game spec, add to Board spec.
Fill out more of the board and cell.
WIP new validator class, additional rspecs passing for board and cell
passing validator and cell specs, everything great except we can't get
to a full board"
WIP specs for filling and clearing by row
all tests passing for valid row-by-row board generation [Finishes #57940610]
[#57940610] WIP testing
[#57940610] WIP testing
[Finishes #57940610] all tests passing for valid row-by-row generation